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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0e27ac4d19ddec50f470efe5f0df615596b2c0042a0b46dbf28efeba0ee9fd' 
  AND token = '4ktE9CQTXffOCBjyU8fSqqc7JE5t13ty2bgZgFI8v4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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