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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504bcffbcc63f9b117fbefcff9b76687daddf820d94978db1f1e699970478dad' 
  AND token = 'YkuCjA1D94rpq1WK4eQvZ5Aq3G1Q190eoIPWVlxddN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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