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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4840b396928930c3dd757c55a54c51f4b0561065d03066b8d9f968f6427ad7b6' 
  AND token = '1viUaC1Uz78PcJySlku4DbpTB3DomPO3B2JwuHR5KGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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