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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54a9f439d4f8660c52c86d111a1b15917cde062148fd87db8630ef1f6eb5336' 
  AND token = 'CkGUKUxmzGXjz0ePMn99geCmWpPFLTC7667v1cTmuEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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