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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b114dbff0a5cc153442449d6c9ce6334885d88dcd9bfd6dc20cdcf6af538059' 
  AND token = 'QpR4z/xEZ6CZ/F9FT5SkcxuEDPhX0ItJ+IgXoB3x+Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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