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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee02861c49028703478c21e8c0bf0079e75511aded8bc9bf7f98c48150d7022c' 
  AND token = 'ypQEFEMy8UwAU6MWS0O7i0nthlNJVLOV0tWkQXtL0/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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