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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85706b3c323343b55df1dde8d2acb3c5f292bcad58dff42dff6e0626d92aced2' 
  AND token = 'hdMeh8JaBEnDX7cbE7BwYSyyf96oArDVbJSaMOxTGME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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