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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417c34db8f2bde00e061bf7441af88954d570594e083716e1a2240134eb66a2b' 
  AND token = 'RBBQZq6dN5ea//X1H/nohUocKR4Y/zOvQFLzcZd6zxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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