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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d8cd5ab3a7ba8d48a389868f33767ed17e9b3e5c2d7bf8e1de99f76f73a049' 
  AND token = 'UI6/QqgvwTO6tFrU7n751h+ni7Zjf9dysqkxgBnsBgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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