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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a5036d4cac8a307a950cdbe9b8db4f4daf57a35779037cb86906d8649eddb0' 
  AND token = 'aUAtYEo7hMPdRG47He1uUm83bYXczmifpjE/Ux/9Z7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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