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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b32b4bad8ff124b4774ccebc5e625eacd2e6211adeb0d6245f87362a131b693' 
  AND token = '4zf0dj7LAXGKPl39QgMhM1ayMXwaO70o8Uns7EzzuQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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