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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c612865311f69e96e6050ec16d648b883a27fbfc146960690cbf33456e0d03' 
  AND token = '/+pTj0gvnSSzO/6ShadwGgolYPlKWpyjgfN3SFrD2P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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