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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c503868d2e10e50be585160ea50115a173097b56139709ec23b75d8c3665631' 
  AND token = 'Mb4LWSbuZ4oZOCGFgYwCAPU6Mhzx5PmlgF34ADdZlTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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