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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77fbad2120c424ec6766eb31b06932207427e1fd32e0e9b195e9f741bbc098e' 
  AND token = 'Uj6wVjrJNcGn6jcxU80BzuXTomHdf2+d8/59fNHzt/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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