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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a625333ed4b82b9d886815b7074a4f191efb76beed28468ed0aa6ed58a1f13' 
  AND token = '7h4u5KcpGoV8bkOCzfs79DYbZl1qxNd8SZ5wzP9e90U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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