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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6224439cc7c5060751968d522dccf21bfe8251ff964b51722c20c0b5769f28dc' 
  AND token = 'DZfo+czZu1iOiiASImbBH5gluC83bjFZLYmZ7zMmg9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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