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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db67e14fbb3b77c294c21d5f98d55f35124efb5ec0e4342ebf816390c058c5c' 
  AND token = 'T21WMJ5mr38txY/9xFwW7b0WlabiaiEUeAFrwVIHq3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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