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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8617e294a10b1f97a96c8a8c79815adf1a0652be4df766e80b01afeb03c2eeb9' 
  AND token = 'il9H9Mhf8eeXju0i2XAKgVyM77MX8pw0wIT6NdFseck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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