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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f229d805c19007459680c9dab48580bc1026778e0f212e093feeed5687f7b6' 
  AND token = 'd0iVt8ZtKV3bZAsOTWn6j+JXEExfE8VCtLI3oZunRYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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