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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2669c833677e963e8e3eedd9a37a34a52e53c145e825ecc3a311b266cf5568a6' 
  AND token = 'd1jrf9ogj6v4/v8YXTMYO+za5lMvjuXAHxvZIQ6qYrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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