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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da205a28b4e7120ce9389544da6eba6b0c47d9922d6b271894261f71f4795fc' 
  AND token = 'X8ixL26sm+CLCSce4A2oo+49VTngIO/ihKL72/Kagxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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