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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20bcb2c20db98a96b641696a6e1232cdb11a642ab9c21e51ebc737aad63b6ff' 
  AND token = 'COBU2KvgXpM+uVtCD/hTOn4SJxerBWol/nEk3WNraKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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