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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b1f74fe539392b5c4aaaaea12c9158847f88158a7b462105bbe55edd59e1d9' 
  AND token = 'XCYlppj2sQw1FdxdRkEmlnZd195IfWQrrXLj6hjBLi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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