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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cfd120f51cf0cdbfdecb21ca9d158e35488d1165ace79ecb782257d1b072a2' 
  AND token = 'yG+jO5NxV7o4oYdX93GJtUFy6w4v9ZuHynqkX1wZrYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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