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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb2fca25ed999d7b2a7e6d07f08fb9fa1ae201e4256d5747915f7fff306a5ee' 
  AND token = 'p8R8vzP6fj5ReboJayKk0p4kh+dXJ2C5Tg2OSOAUo54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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