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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03a6a0e548d0e08aaad5fe58b2606dae484381ed921771b983b36c1153b45ef' 
  AND token = 'Ij5QBM1hTY9muydPm+no7wfO8AjyIHad+IYAYEjHu74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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