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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7473e32c56a1c4a3bbae6cc668723bec01e99ceb1d6efc71aab6d00135462128' 
  AND token = '59NIjGVvORQItCrYW+k0Q4nLTcyT5iHdCGFYNhbK6fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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