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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace78476cccd49296d24f8362baa6c93b44e402c27458898469dd2b926b27663' 
  AND token = '0F9NX22bbQWVqwQuyZfSmdM6WcI6gbO4lA/Ef6B1ai8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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