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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c96408b8bb08fcc06bfe4266d754adf2b7629c960cd3f1ea37ac89e3aaf969' 
  AND token = 'vE7x8jHg+4JE/KtPr4do+gBxwAVmsJriV1rifkQXfpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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