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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988afb8a5d0cea5c8a7684859e20c34ba39c4393b00e0813fe57409f52debf42' 
  AND token = 'i+SQRAy/2ScJ7DpBm/OaRhl2p+FcZCIsGeG5Kg+LXD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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