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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c34c91f53da2cf24329ca92090b8b24eadfc386573307dbd789b080d1b05f1' 
  AND token = 'q6JfZ+WaovVzBS4HjM5GrXtny3Al9plOgnE40aZxxS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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