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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8201768d2bda2005258c49df7290096f0e042c0efbd942d3c33a1628e2c7dd2d' 
  AND token = 'M47T31Zl1bayLi5fvDFxaJ0B8Tbnk4IfjxDsUtC2oBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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