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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c2f39ca02200e1c93ff4b0fd30babeef43a1f68f9d3f029f591275cd1f1463' 
  AND token = 'eux7xCQywKjD2BKbfeeGzhamuDltOm/sg8/E0ZRQ/Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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