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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e290708e9ccb48dad23391237d2edaa7aa3a309fa93a9067412e4ecad1c54f' 
  AND token = '5SCM62j9jgOdrsLRtu7KoKOdh7R8h5UK9js10mV/72k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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