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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce967b8d80f8f6534d5f3e8c0d847089627c86dc5d27ea3b0b3885d1ad2388a' 
  AND token = 'JXrevXE2p5X+HAY2xi6PSk8NwTYFwM7jRBZI8H4BTIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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