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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10911c5e16ba57f8a4c838dd69b4a17cb2625f13ad5d2751d39fe6b8426bb540' 
  AND token = 'Y+4bbtBN3EvKyV0AyPku/CNHr7S0e7QpUCLyVEWWY0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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