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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ba3aa36a77d9835a1e5a7c36713e2e4b8b398e7524cbdafe57ca87994666ae' 
  AND token = 'kiTgCp8//lg8iJ/706jsTBWvt/troFGVeSt2LwFG0a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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