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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93f0f6551a4d3d289add4a31b74c37fb18055ad5e4e9d406a5ce63ef1a83b0d' 
  AND token = 'toDDovGajlf9oP9eV7ojNIiXB57VRaX6m0DEA3Pvl0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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