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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d2c0e03dc7b04203fb9a0b1e184aac764bb2daf2ea96089bfb87c8e0c2a55b' 
  AND token = '9XWJT1PkvfVbbeyy0qdfyq+tVuutUvlel+lE02KSfQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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