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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a58df82f36ae8b5e8794fba5af6c062ebe21439e91f79b5eae78c607e4d3630' 
  AND token = 'B/h7I0UVNnRnwuQ5C4/CnsPi9OZQABDUkeXzcp97UIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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