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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbd77d162eee4f73bcb0e7224db53f19cbca0f47a8c60a8a5f1e9f45879da69' 
  AND token = 'qgpYILv8RQhEa7Tkcn81VW5C4vwiks9WI+4PfAbnzMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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