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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b4eff41d8cd71cea0a71b5275e530000438437ac296ffd68bd0c865a0a6eed' 
  AND token = 'g6aCU1QmONCDDi0+/SauGd4O1x0H/GDvxspODCBo3g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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