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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4e1636e0fc3962bb7a9a79db5b731ec6153e41d924ae0e1be029a6c47bbeae' 
  AND token = 'lLkHkSnrnAhIDF0TxfqApR/dfm1aRGxIWCD5FGNukmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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