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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b057501c48b0ee2beb51662426bbbd4fb544a769cba66a5157b9de2418610d' 
  AND token = 'jAW/hS8pAKuFZzPedAnzITEQFrWb/Ebd971c6PDFUCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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