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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fdd5307dbad2f123526485d23ff1170b03833399780c925c3db361b026f1ca' 
  AND token = 'O5VK9bHBmQLnfu0j3LmcRBHj/SF2X6fIywd6osRo8EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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