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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7534f017085914177a9aca760f3d1a09a511c71ea948ec20f3a94886969c9a5' 
  AND token = 'KXrbbP0beiWnM7p0LglB8aWndh2IgBGbm+slXNDf8PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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