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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da37dd66d8e7a4f5ba24a6d14bbf7275d5b249d0c3e79510bfe36d3fde4b14de' 
  AND token = 'ZAs4ufIYumsDkfgsy6RHFCLCJwKCobbHoJHaPVcmDc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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