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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a18085811a7c7991e25ea294a43c43b5d4bf206165364bc3039823d056f4d1' 
  AND token = 'byhSDgYesQGFIOaEf08x5jpfAJYGilodf/tKsCWpses=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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