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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdbaaefe83b07d13150fd35148570e3655b671ebe22e7f52d119b208a8138ae' 
  AND token = '5WFmfcH/f4J8AAxT0jq/XpIqNZ/HPmXVEBFN60bpc8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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