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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36db5ac71afa59542b46f98d81c1ddbf0f46c382949b5a557c8a79304cc8bf9b' 
  AND token = 'ub9k7FEjtZ3ScvF88QRSDyjKz4ZlWIAIWvUUPul/WFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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