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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57cc1851648b75d67dd16f57dc402e51a327248a6c8da57e79934447d612247' 
  AND token = 'f0YwbcN+n7v5HLESeNxPAYCZb3ZzSAeAe+lueAxCRSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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