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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7febd6230ec892a31594e038e2154f138e626f9c99eed938ac7c722fa7b0c57c' 
  AND token = '7hzyXbX+VW2uZL666ivqLi1xjnWkPoPPPCTk4rsVKx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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