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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bef7a978652ec14ec93a4fc19c9033a75df62b4e2fa45dd9c6e17271ff48adf' 
  AND token = 'uCacTVtEGhDoPEpbPXNAyJHEmBlkI+s3DOU08wJDfpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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