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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88d88ac8b4e9e7dce4fc6c7f8669c36590b2c3ac0e80f9a9710b72566970602' 
  AND token = '/jk4lM68bl5bNL2gOkkvH6/0GmpXFj+WbTDGO/ONwIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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