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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99288d62146d36599fe1f1e4c0b16b25f758ec07931ebe8ea37f1a6bf08af6b6' 
  AND token = 'TLnGlxmLwmLDZY2Tqzaxs932NXicrWSu0Xzz8V5+dSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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