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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4a5bf07f400aa118362a665f861f5ea7cb30c74d745858b9546c0a393bc2c3' 
  AND token = 'oalsat3bMyFl9653eWPlAOzMxW1bGlENqVUiJSTBVeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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