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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8c0caf4fece7dfcfd958dd780ca5a44d84d9e4b15cc8c9fcffcceb3304876d' 
  AND token = 'WrbH76N7YyQUIhTVWJGfGxTzrAnOF+l6nf9gnbOyfao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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