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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa3c5907e0add72f461da4af1b5123c7f2bcb0846061acb7c30cd8c9fe631a3' 
  AND token = 'VDUuq84IReZQhNHbfoA8OhiUZrUdTjAZtcDO3jrum1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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