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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432b98adaa22951c668d10ae0747e7cc3b762dc4e1c84317a370a1aa9b62a5d8' 
  AND token = 'D83wOvLuZAB4iDQQKjylAFTxcnP0hoa82rQgS5oON4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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