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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e223caf335a4bff412a3829a21e92fbdaf1310d8e0edb1b079026bb44dde29b' 
  AND token = 'e0cllsaypwOp7h/HXZpRF3+/71QppYqfxehzQ7t4kVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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