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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d4f09e85fe38fc6b2c7e07a9d3cc23ad598372e8200a945f7532965611ffe2' 
  AND token = 'dY5Ip60f7xMdXu6VjzoRn/DyiwHm+1b3Qx4f+RfQ1MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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