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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56902d6f05ed323583bcbc171552c3cf603180b569a02cdcc02a010ab60054f4' 
  AND token = '1KzO935l7vdKbD9n0nXtcBqMwOW5iw/dott4DMPyLkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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