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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b05050adef42ebae7dcf4c2c057ec69db767857c14d10861b1d15591b0121f2' 
  AND token = 'T5Vc7xlgukMARzwNPof/YWIF8ob9dHPEyEovazy6PpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}