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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f866100e40f1805c7e2d9844d0211922dfb11831bb4b13e458602ab28a7eac' 
  AND token = '6HJbzhm+9f9krQz4qYPyYIYqY9LcO1Nl6H+8w1VrBAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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