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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c284725af9dac384ebcf8347c33871e1da4704e08438c7d612987b087e2bbc' 
  AND token = 'XKGB6gHcQES9De/9Oh/Wb80YKF3tfkSYHIlicyDv7SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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