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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9f30343cfb8cf8c56822c1cb36cc4f7c55f13998a27062f85f1b129af5433d' 
  AND token = 'WFyfFwppWlDCwPWSOi2t9CP7guUnAjelQaToGgDOZxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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