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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908ca475f248a4cd74df606c7f8457a2a2a7ffa9c44c30111a0895ea342aed59' 
  AND token = '0v8TiSiErguzcmRAke6YOMbOu84boemTVpO6AXP028g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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