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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf2ed652571ff0b322d067af4e52764becbc70172dcaa48b95ffad836de1485' 
  AND token = 'vVLgLk2MANRP5f3s9rHHK9L5KWt6PD2DSp7jNNrdfLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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