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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ae4e5101a19cdf5c2c16eed7368c396698f21dc95ed7bd6c261bad94f526d9' 
  AND token = 'N5Fj/QqaD7/+NtUblh2fMxnpzApa/U3WK11p3P54QpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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