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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c66675a68ce59bbb090cdda2baabdb8e9526c6a2a4a7f7393c17d4a9745f5ce' 
  AND token = 'fmeDw5Z1j8EP9Hl58Og2aTsXHI3lBLwdzvOforIG2nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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