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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75625ecaa125eb09c51edf12b248bfc95a2e4b1e42ee7c0c21160d5e862b336d' 
  AND token = 'IFu5H7GOkKmch56e0HMsSAqufSM/iFONP6dRTCO6xdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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