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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8502d84c815962eded81c8c295d4201f90e89ff0118740d6a3c4f4ac0d20db28' 
  AND token = 'g1WjUY5CUrPG9GPCT8i2+7LVEoMHgwfFAsPxWP5UcsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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