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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd813af9475009bbdf1a8f5e1a32186f25006c20f35164a12904a7f651a2f0788' 
  AND token = 'UVSL+9f9svW1GFDJfcN8Mep8invixqDO1Fe7jkZWCAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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