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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48071568ef676a47ae58582071e425c1f95be34f1c31dc36addad84bd1b11c53' 
  AND token = 'YoXvNdnBdvVb0JQtDmW2J5Aryp7vn+jPu5E0FnuBGIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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